Heat settings

[22mini20]

I have a 2015 Sierra Denali with dual climate control. Now I have noticed when I get out of my truck I make sure before I leave my fan speed on high and my temp set to hi and the sync so both sides are on high. Now every other car I’ve owned it stays that way for the next time I drive it. Now if I turn the truck off get out then get back in the truck and start it back up within 5-10 minutes then the fan speed will still be on high. Now if I wait say 30 minutes or longer then my fan speed defaults back to off or on the lowest fan setting. Any suggestions on how to resolve it to stay the way I set it before I turn the truck off....

[15 Z71]

If you set it on auto and pick a temp it should turn it on hi with remote start. Then when u turn on key it will go back down.